Roofing Shingle Calculator — Bundles & Squares
Enter your roof footprint and pitch to get the number of shingle bundles, roofing squares, total roof area, and underlayment rolls your roof needs.
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How it works
roof area = footprint × pitch multiplier; bundles = ceil(roof area ÷ 100 × 3)
Shingles by roof footprint (6/12 pitch)
| Roof footprint | Roof area | Squares | Shingle bundles |
|---|---|---|---|
| 1,000 sq ft | 1,118 sq ft | 11.2 | 34 |
| 1,500 sq ft | 1,677 sq ft | 16.8 | 51 |
| 2,000 sq ft | 2,236 sq ft | 22.4 | 68 |
| 2,500 sq ft | 2,795 sq ft | 28.0 | 84 |
Footprint is the ground area the roof covers, not living area. A 6/12 pitch adds about 12% to the flat area; steeper roofs add more (8/12 ≈ +20%, 12/12 ≈ +41%). Three bundles cover one square (100 sq ft); add 10–15% for waste, hips, and valleys.
Frequently asked questions
How many bundles of shingles for a 1,500 sq ft house?
Watch the difference between house size and roof size. If the roof footprint is about 1,500 sq ft, a 6/12 roof is roughly 1,680 sq ft (≈17 squares) and needs about 51 bundles at 3 bundles per square. A two-story 1,500 sq ft house has a smaller footprint, so measure the roof, not the living area.
How many squares is a 2,000 sq ft roof?
One roofing square is 100 sq ft, so 2,000 sq ft of roof is 20 squares — about 60 bundles of architectural shingles plus 10–15% for waste. That is 2,000 sq ft of actual roof surface; a 2,000 sq ft footprint at a 6/12 pitch is closer to 22 squares.
Is roof area the same as house square footage?
No. House square footage is living area; roof area is the footprint multiplied by a pitch factor. A steeper roof has more surface than the floor below it, and overhangs add a bit more — always estimate from roof measurements.